Berkas:HallPatentCover.pdf
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Ringkasan
| Deskripsi |
English: Cover of the United States Patent and Trademark Office patent No. 400,766 granted to Charles M. Hall for his process of reducing aluminium by electrolysis on April 2, 1889 |
| Tanggal | |
| Sumber | sent per email as a response to an inquiry to Alcoa |
| Pembuat | United States Patent and Trademark Office |
Lisensi
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This media file is in the public domain in the United States. This applies to U.S. works where the copyright has expired, often because its first publication occurred prior to January 1, 1929, and if not then due to lack of notice or renewal. See this page for further explanation.
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This image might not be in the public domain outside of the United States; this especially applies in the countries and areas that do not apply the rule of the shorter term for US works, such as Canada, Mainland China (not Hong Kong or Macao), Germany, Mexico, and Switzerland. The creator and year of publication are essential information and must be provided. See Wikipedia:Public domain and Wikipedia:Copyrights for more details.
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